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In this paper we introduce a low complexity and accurate technique for target image search and retrieval. This method, which operates directly in the compressed JPEG domain, addresses two of the CBIR challenges stated by The Benchathlon Network regarding the search of a specific image: finding out if an exact same image exists in a database, and identifying this occurrence even when the database image...
JPEG is an international industry standard algorithm for compressing continuoustone still images. JPEG which stands for Joint Photographic Expert Group is currently one of the most popular encoding formats used for storing and transmitting images. JPEG is a variable coding bit-rate method and in this chapter two algorithms for controlling the produced compression ratio are reported. The bit-rate control...
CMOS-based image sensors offer the unique capability of integrating all electronic circuitry of a digital camera on a single chip. The resulting system, hereafter referred to as micro-camera because of its high level of integration, has a great potential in terms of low-power consumption, rendering a wide range of new applications in the field of portable multimedia devices possible. This chapter...
This paper addresses the problem of automatic detection and recognition of impulsive sounds, such as glass breaks, human screams, gunshots, explosions or door slams. A complete detection and recognition system is described and evaluated on a sound database containing more than 800 signals distributed among six different classes. Emphasis is set on robust techniques, allowing the use of this system...
This paper introduces a novel low-power VLSI architecture dedicated to algorithms based on elastic graph matching. The targeted application is face verification for low-power mobile devices (e.g. mobile phones, personal digital assistants, wearable computing devices). A description of the overall verification system is provided jointly to a detailed discussion of the full-custom graph matching coprocessor.
This paper reports a low-power multiscale morphological coprocessor for mobile face authentication devices. In such a system, face verification is performed by extracting mathematical morphology features (erosions and dilations) using a set of structural elements of increasing size. The proposed architecture reduces the number of operations by reusing results, and lowers the amount of needed memory...
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